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Foreign fraudsters have been known to resort to such measures as part of their desperate attempt to obtain a visa or their victims' money.

However, this latest tactic reveals how ISIS are now using similar methods in their plot to terrorise the West.

At least two British women have already fallen for their scam, with security and immigration fraud experts fearing many more Britons may have also been duped.

AP

At least two women are known to be victims of the plot

Kim Howells, former chairman of Parliament’s ­intelligence and security committee, told The Sunday People: “It’s an issue that needs monitoring very careful. They only need to get one efficient bomber in and that’s it."

Kim Sow and Delene Alouane from the group have helped two women in the past three months alone after they were tricked into marriage by ISIS supporters following a fling in Turkey.

One victim, who cannot be named for security reasons, ended up unknowingly marrying an ISIS supporter after falling for a man she believed to be Turkish while on holiday in 2012.

They only need to get one efficient bomber in and that’s it

Kim Howells

After returning to the UK, the pair kept in contact over the phone and through the internet before marrying in April 2014.

The husband was then able to gain rights to the UK under a spousal visa.

However, the man vanished just two months later - sparking a desperate search to discover where he had gone.

The woman began hunting for clues on the computer he left behind, and the results were simply devastating.

Ms Sow said: "Logging on to his Facebook, reading his messages and exploring the network of people he was friends with, she found out to her absolute horror that the person she thought she knew was in fact ­connected to ISIS.

"He was linked to a number of profiles expressing extremist views and celebrating jihad."

When the pair first met, there was nothing to suggest the man was an extremist in his views or his religious beliefs, Ms Sow added.

BBC

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It was later revealed that the ISIS supporter had also been joined in the UK by a member of his family, who had used a similar method to trick another British woman on holiday in Turkey.

Ms Sow went on to contact the Home Office's Immigration Intelligence Department, but she claims they cannot tell the women anything about the men - even if they are still in the UK - due to data protection reasons.

A Home Office spokesman said: "We don't comment on matters of national security."